Control system for condenser winding machines



March 22, 1938. R, w, KNIGHT CONTROL SYSTEM FOR CONDENSER WINDING MACHINES Filed July 22, 1936 INVENTOR. Habe r t W Kn i ATTRNEY.

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J O QN Patented. Mar. 22, 1938 UNITED STATES CONTROL SYSTEM FOR CONDENSER WINDING MACHINES Robert W. Knight, Collingswood, N. J., assignor to Radio Corporation of America, acorporation of Delaware Application July 22, 1936, Serial No. 91,881

Claims.

This invention relates to electrical control systems for condenser winding machines such as that disclosed by a copending application of Thomas Ackley, Serial No. 91,882, filed July 22, 1936, and has for its principal object the provision of an improved control system which is so a1'- ranged as to cause the machine successively to (l) close an automatic mandrel for gripping the ends of the paper and metal foil strips, (2) rotate the shaft of the mandrel for winding the paper and foil on it, (3) disengage the paper and foil feed rollers to permit the paper and foil to be drawn forward by the mandrel, (4) engage the paper and foil strip feed rollers to prepare them to receive and feed the strips to the mandrel, (5) cut the foil strips which are fed slower than the paper strips for securing proper overlap of the paper and foil at the beginning and end of the condenser, (6) cut the paper strips, (7) apply a sticker to seal the outer turns of the paper together, (8) stop rotation of the automatic mandrel, (9) eject the completed condenser, and (10) open the automatic mandrel to receive the ends of the paper and foil strips for rewinding the next succeeding condenser.

The invention will be better understood from the following description when considered in connection with the accompanying drawing and its scope is indicated by the appended claims.

a The single ilgure of the drawing is a wiring diagram of the system through which operation of the machine is controlled.

This electrical control circuit includes an oscillator generator |65 which may be tuned to generate a signal having a frequency of 1000 cycles, and is energized from a socket power unit |66 and is coupled to the inputl terminals of a bridge network |61 through an amplifier |68, a coupling transformer |88, a push-pull amplier |10 and a. transformer |1|. Interposed between the transformer |1| and the bridge |61 are a voltage control switch |12, a voltmeter |13 and a switch |14 associated with a plurality of compensating resistors connected to the various secondary leads of the transformer.

The bridge |61 consists of an arm including a resistor |15, an arm including adjustable resistors |16 to |18 which may be adjusted to produce condensers of diierent capacity, an arm including a capacitor |19 and an arm |80 connected through terminals |8| and |82 to the terminals of the condenser or condensers being wound.

The output potential of the bridge |61 is applied to the operating coil |83 oi the clutch solenoid |04 through a channel including amplifiers |84 and |85, a rectier |86, a resistor |81 and an ampliiier |88. Connected in the input circuit in series with the resistor |81 is an adjustable resistor |89 which is supplied with current through a rectifier ISI from the same power source as the amplifier channel.

With these connections, the output current of the bridge |61 is controlled by the capacity of the condenser which is being wound and which is 10 connected to the bridge terminals i8||82. This output current is amplified by the channels |84 to |86 and appears in the resistor |81 as a direct current which decreases as the capacity of the condenser increases. The control grid of the output amplier is therefore subjected to a negative bias potential component which becomes less negative as the capacity of the condenser increases. It is also subjected to a positive bias potential component which may be adjusted by means of the adjustable terminal for adjusting the point at which current is released through the amplifier I' 88 for operating the solenoid |04. While the various constants utilized in the construction of the system have been indicated on the drawing, it will, of course, be undersood that these constants are not critical but may be varied' to Vsuit the particular conditions under which the system is operated.

I claim as my invention:

l. In a system for continuously measuring the capacity of a condenser during its winding operation, the combination of a network which includes said condenser and is provided with input and output terminals, alternating current supply means connected to said input terminals, an ampliiier provided with input and output circuits,- means interposed between said network output terminals and said amplifier input circuit for impressing on said input circuit a potential which is of one polarity and is dependent on said'capacity, means for impressing on said input circuit a potential of oppositepolarity, and a solenoid connected in said amplier output circuit and operable in response to a value of said capacity predetermined by the magnitude of said opposite polarity.

' 2. In a system for continuously measuring the capacity of a condenser during its winding operation, the combination of a network which includes said condenser and is provided with input and output terminals, an oscillation generator connected to said input terminals, an amplier provided with input and output circuits, means interposed between said network output terminals and said amplier circuit for impressing on said input circuit a potential which is of one polarity and is dependent on said capacity, means for impressing on said input circuit a potential of opposite polarity and a device connected in said ampliiier output circuit and operable in response to a value of said capacity dependent on the magnitude of said opposite polarity potential capacity of the condenser during its winding operation, the combination of a network which includes said condenser and is provided with input and output terminals, an oscillation generator connected to said input terminals, an amplifier provided with input and output circuits, means interposed between said network output terminais and said amplier input circuit for impressing on said input circuit a potential which is of one polarity and is dependent on said capacity. means for impressing on said input circuit a potential of opposite polarity, a device connected in said amplifier output circuit and operable in response to a value of said capacity dependent on the magnitude of said opposite polarity potential, and means for adjusting said magnitude.

4. In a system for continuously measuring the capacity of a condenser during its winding operation, the combination of a bridge network which includes said condenser and is provided with input and output terminals, alternating current supply means connected to said input terminals, an am- 3. In a system for continuously measuring the pliller provided with input and output circuits, amplifying and rectifying means interposed between said network output terminals and said ampliiier input terminals for applying to said input circuit negatively polarized uni-directional potential which varies as the capacity of said condenser. means for applying a positively polarized uni-directional potential to said input circuit. and means for adjusting the magnitude of said positively polarized potential.

5. In a system for continuously measuring the capacity of the condenser during its winding operation, the combination of a bridge network which includes said condenser and is provided with input and output terminals, alternating current supply means connected to said input ter minals, an amplifier provided with input and output circuits, amplifying and rectiiying means interposed between said network output terminals and said ampliiler input terminals for applying to said input circuit a negatively polarized unidirectional potential which varies as the capacity of said condenser, means for applying a positively polarized uni-directional potential to said input circuit, means for adjusting the magnitude of said positively polarized potential, and a device connected in said ampliiler output circuit and operable at a value of said capacity dependent on the adjustment of said positively polarized control potential.

ROBERT W. KNIGHT. 

